/ Dictionary / Index B bituminous coal: Meaning and Definition of Find definitions for: bitu'minous coal' Pronunciation: [key] a mineral coal that contains volatile hydrocarbons and tarry matter and burns with a yellow, smoky flame; soft coal. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. bituminous biunique Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language